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https://issues.apache.org/jira/browse/FLINK-3564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15176674#comment-15176674
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ASF GitHub Bot commented on FLINK-3564:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/1754#discussion_r54808793
--- Diff:
flink-libraries/flink-table/src/test/java/org/apache/flink/api/java/table/test/DistinctITCase.java
---
@@ -0,0 +1,92 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.api.java.table.test;
+
+import java.util.List;
+import org.apache.flink.api.java.DataSet;
+import org.apache.flink.api.java.ExecutionEnvironment;
+import org.apache.flink.api.java.table.TableEnvironment;
+import org.apache.flink.api.java.tuple.Tuple3;
+import org.apache.flink.api.java.tuple.Tuple5;
+import org.apache.flink.api.table.Row;
+import org.apache.flink.api.table.Table;
+import org.apache.flink.test.javaApiOperators.util.CollectionDataSets;
+import org.apache.flink.test.util.MultipleProgramsTestBase;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+@RunWith(Parameterized.class)
+public class DistinctITCase extends MultipleProgramsTestBase {
+
+ public DistinctITCase(TestExecutionMode mode){
+ super(mode);
+ }
+
+ @Test
+ public void testAllDistinct() throws Exception {
+ ExecutionEnvironment env =
ExecutionEnvironment.getExecutionEnvironment();
+ TableEnvironment tableEnv = new TableEnvironment();
+
+ DataSet<Tuple3<Integer, Long, String>> input =
CollectionDataSets.getSmall3TupleDataSet(env);
+
+ Table table = tableEnv.fromDataSet(input, "a, b, c");
+
+ Table distinct = table.distinct();
+
+ DataSet<Row> ds = tableEnv.toDataSet(distinct, Row.class);
+ List<Row> results = ds.collect();
+ String expected = "1,1,Hi\n" + "2,2,Hello\n" + "3,2,Hello
world\n";
+ compareResultAsText(results, expected);
+ }
+
+ @Test
+ public void testDistinct() throws Exception {
+ ExecutionEnvironment env =
ExecutionEnvironment.getExecutionEnvironment();
+ TableEnvironment tableEnv = new TableEnvironment();
+
+ DataSet<Tuple3<Integer, Long, String>> input =
CollectionDataSets.getSmall3TupleDataSet(env);
--- End diff --
Why not use `get3TupleDataSet()` which has more duplicates?
> Implement distinct() for Table API
> ----------------------------------
>
> Key: FLINK-3564
> URL: https://issues.apache.org/jira/browse/FLINK-3564
> Project: Flink
> Issue Type: New Feature
> Components: Table API
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Minor
>
> This is only syntactic sugar for grouping of all fields.
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